Mobic In Nov I was diagnosed with rhumetoid arthritis, and was given Mobic. I started taking 7.5 mil once a day, then was given samples (when I ran out) of 15 mil. This past week, I have started to have pain in my knees.....I am wondering if this is a side effect of the Mobic. Has anyone else experienced something like this? I also started feeling very anxious about things.